When Tilisu Severin enters the tomb it becomes apparent that the Severin Family are not what they seem, and will be further evidenced by raiding their manor for incriminating evidence. With clear evidence that they mean to overthrow House Redoran, Adril gives the task of eliminating the family, and the Morag Tong Assassins massing in Ashfallow Citadel.

Seldri will suggest a plan to identify the members of the Ulen family who may be present on Raven Rock by hiding within the Ulen Ancestral tomb, as someone had recently been leaving offerings within it. Upon waiting within the tomb, the player sees Tilisu Severin enter the tomb. Upon interrogation, will insist that she is not a member of the Ulen family, that she is just leaving offerings for the dead. Sounds like a pretty bad liar.

Report back to Arano, who requests that you search for evidence within the Severin's home, Severin Manor. Severin Manor is the house closest to the Earth Stone. Upon entry it is likely that the player will be attacked by Tilisu and Mirri Severin, who must both be killed. The evidence needed can be found within the Severin Family Safe (a key can be looted off Mirri Severin's remains) which is located within the master bedroom, in the form of a letter titled "The Ulen Matter".

Next to entrance to the second door on the left side of the hallway, near the gates

The final two are behind pillars located next to three swinging door traps, on the right hand side of the passageway. Move with caution

At the end of the corridor is the final room, where Vendil Severin can be found, along with two Morang Tong Assassins. He will not go quietly, so be prepared for a fight. Upon their deaths, the quest will update, telling the player to return to Arano. Take the time to loot the remains of Vendil, as he has the unique chitin armor.

Upon returning to Arano, he requests that you follow him to speak to Councilor Morvayn, who will reward the player with the newly vacant Severin Manor and a good amount of gold. The manor is easily the best player housing one could hope for, containing a complete forge, alchemy lab, enchanting table, numerous weapon plaques, four mannequins, and much more!